Printer having a data output time controller

Abstract

A printer, where an image can be printed on a desired position of a printing paper both when image data is processed and when the image data is not processed, counterbalances the time delay caused by data processing by advancing the timing in which a controller outputs the image data. When the print operation is requested, the controller judges whether the data processing is set ON or OFF if the data processing circuit is connected. When the data processing is set ON, offsets of left and right or up and down are changed in order to quicken the output timing of the image data. The above timing is changed based on the time for which the data corresponds to the data of (M-1)/2 bits, and (N-1)/2 rows of a table are output by the controller.

What is claimed is: 
     
       1. A printer for printing an image based on printing data input from a host apparatus, comprising: a controller for controlling print execution to output printing data at a predetermined timing based on input printing data,   data processing means for processing the input printing data,   engine means for printing an image on a printing medium based on a one of the processed printing data processed by said data processing means and the input printing data, and   output advancing means for advancing the time, from the predetermined timing, when the controller outputs the printing data by determining a time period of delay by which said data processing means delays an input of the printing data to the engine means,   wherein said engine means includes feed means for feeding the printing medium and signal means for sending a feed starting signal to said controller, and said controller includes a first instruction means for instructing said engine means to feed the printing medium, output means for outputting the printing data when a predetermined time, which constitutes the predetermined timing, has passed after receiving the feed starting signal from said signal means, a data memory for storing the printing data, and reading means for reading the printing data from said data memory.   
     
     
       2. The printer according to claim 1, wherein said controller further comprises a bypass means for bypassing the data processing by said data processing means. 
     
     
       3. The printer according to claim 1, wherein said output means outputs the printing data at the predetermined timing when said controller receives the feed starting signal from said signal means when said bypass means bypasses the data processing. 
     
     
       4. The printer according to claim 2, wherein said controller further comprises a switch for instructing said bypass means to bypass the data processing. 
     
     
       5. The printer according to claim 2, wherein said controller further comprises second instruction means for instructing said bypass means to bypass the data processing based on a command input from the host apparatus. 
     
     
       6. The printer according to claim 1, said output advancing means includes an address indicating means for indicating a latter address as a start address for reading the printing data from said data memory.